CVE-2026-47303: CWE-302: Authentication Bypass by Assumed-Immutable Data in Microsoft .NET 10.0
Authentication bypass by assumed-immutable data in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-47303) in Microsoft .NET 10.0 involves an authentication bypass caused by the assumption that certain data is immutable within ASP.NET Core. This flaw enables an attacker with some level of authorization to escalate privileges remotely. The vulnerability is tracked under CWE-302 (Authentication Bypass) and has a CVSS v3.1 base score of 8.8, indicating high impact on confidentiality, integrity, and availability. Microsoft has published an official fix to address this issue.
Potential Impact
An attacker who is authorized on the network can exploit this vulnerability to bypass authentication controls and elevate their privileges, potentially gaining unauthorized access to sensitive resources or performing unauthorized actions. The vulnerability impacts confidentiality, integrity, and availability of affected systems.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for .NET 10.0 as detailed in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47303 to remediate this vulnerability.
CVE-2026-47303: CWE-302: Authentication Bypass by Assumed-Immutable Data in Microsoft .NET 10.0
Description
Authentication bypass by assumed-immutable data in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
CVSS v3.1
Score 8.8high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-47303) in Microsoft .NET 10.0 involves an authentication bypass caused by the assumption that certain data is immutable within ASP.NET Core. This flaw enables an attacker with some level of authorization to escalate privileges remotely. The vulnerability is tracked under CWE-302 (Authentication Bypass) and has a CVSS v3.1 base score of 8.8, indicating high impact on confidentiality, integrity, and availability. Microsoft has published an official fix to address this issue.
Potential Impact
An attacker who is authorized on the network can exploit this vulnerability to bypass authentication controls and elevate their privileges, potentially gaining unauthorized access to sensitive resources or performing unauthorized actions. The vulnerability impacts confidentiality, integrity, and availability of affected systems.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for .NET 10.0 as detailed in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47303 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-05-18T23:53:33.898Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47303","vendor":"Microsoft"}]
Threat ID: 6a56883a68715ace43099963
Added to database: 07/14/2026, 19:04:26 UTC
Last enriched: 08/13/2026, 14:17:33 UTC
Last updated: 08/28/2026, 22:52:11 UTC
Views: 114
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